HowTo Read ProcFS

Information in /proc/virtual

  /proc/virtual
    .../info

  /proc/virtual/<pid>
    .../info
    .../status
    .../sched
    .../cvirt
    .../cacct
    .../limit

/proc/virtual/info

/proc/virtual/<xid>

This directory contains several files which can provide valuable information on the current context state and settings.

/proc/virtual/<xid>/info

ID:     1001
Info:   83c37000
Init:   0

this shows the context id, vx_info location and init pid

/proc/virtual/<xid>/status

UseCnt: 38
Tasks:  16
Flags:  0000000000000000
BCaps:  00000000d46c04ff
CCaps:  0000000000000000
Ticks:  0

this contains the usage count (references) and task count, as well as the context flags, capability boundary and context capabilities

/proc/virtual/<xid>/sched

Token:                 0
FillRate:              1
Interval:              4
TokensMin:             6
TokensMax:            50
PrioBias:              0
VaVaVoom:              0
cpu 0: 0 0 0

shows the current amount of tokens, scheduler parameters (fill rate, interval, min/max), the priority bias and the calculated vavavoom (priority bonus)

/proc/virtual/<xid>/cacct

UNSPEC:            0/0                             0/0                             0/0           
UNIX:             35/2375                         35/2375                          0/0           
INET:             12/531                          56/1937                         57/1705        
INET6:             0/0                             0/0                             0/0           
OTHER:             0/0                             0/0                             0/0           
forks:  0

this accounts socket messages for the listed protocols, as incoming messages/bytes and outgoing messages/bytes

/proc/virtual/<xid>/cvirt

BiasUptime:     16.87
nr_threads:     119
nr_running:     0
nr_unintr:      0
nr_onhold:      0
load_updates:   383736593
loadavg:        0.00 0.02 0.02
total_forks:    3763748

this contains the uptime bias, the number of threads, thread stats (running, uninterruptible, on hold), the number of load updates, the load averages (1,5,15) and the number of forks

/proc/virtual/<xid>/nsproxy

NSProxy:        f7d7a4f0 [f7c91280,f783e200,f7824dc0]
Namespace:      f7c91280 [#3]
RootPath:       /
SysName:        Linux
NodeName:       XXXX.test.org
Release:        2.6.26-1-vserver-686
Version:        #1 SMP Sat Jan 10 21:26:14 UTC 2009
Machine:        i686
DomainName:     (none)
SEMS:           250 32000 32 128  123
MSG:            8192 16384 145
SHM:            33554432 2097152  4096 2556

This contains the utsname settings (sys, node, rel, vers, machine, domain)

/proc/virtual/<xid>/limit

PROC:           16              17              -1           0
VM:          14440           15331              -1           0
VML:             0               0              -1           0
RSS:          5478            5847              -1           0
ANON:         1516            1516              -1           0
FILES:         140             155              -1           0
OFD:           122             122              -1           0
LOCKS:           1               3              -1           0
SOCK:            9               9              -1           0
MSGQ:            0               0              -1           0
SHM:             0               0              -1           0

limit columns are:

1. current
2. max observed
3. limit
4. number of hits

limit rows are:

• processes,
• virtual memory,
• locked memory,
• resident set size,
• anonymous memory,
• number of files,
• filedescriptors,
• locks,
• sockets,
• message queues,
• shared memory

Debug settings in /proc/sys/vserver

  /proc/sys/vserver
    .../debug_switch
    .../debug_xid
    .../debug_cvirt
    .../debug_limit
    .../debug_dlim
    .../debug_nid
    .../debug_net

/proc/sys/vserver/debug_switch

/proc/sys/vserver/debug_xid

/proc/sys/vserver/debug_cvirt

/proc/sys/vserver/debug_limit

/proc/sys/vserver/debug_dlim

/proc/sys/vserver/debug_nid

/proc/sys/vserver/debug_net